On 01/04/2012 07:28 AM, Daniel V. Klein wrote:
> You probably want to look at "promise_repaired" at
> http://cfengine.com/manuals/cf3-reference.html#classes-in-_002a - but note
> that this applies to the WHOLE promise, so you should be careful where you
> set the class (that is, in the main promise, in a subcomponent, etc). But
> FWIW, I use this feature extensively.
Here is an example of making changes to a file, then running a command
if if the changes were made.
bundle agent sysctl_ora {
vars:
"sysctl_var[fs.aio-max-nr]" string => "1048576";
"sysctl_var[fs.file-max]" string => "6815744";
"sysctl_var[kernel.shmall]" string => "2097152";
"sysctl_var[kernel.shmmni]" string => "4096";
"sysctl_var[net.core.rmem_default]" string => "262144";
"sysctl_var[net.core.rmem_max]" string => "4194304";
"sysctl_var[net.core.wmem_default]" string => "262144";
"sysctl_var[net.core.wmem_max]" string => "1048576";
files:
"/etc/sysctl.conf"
comment => "Oracle needs these kernel paramaters set",
edit_line => set_variable_values("sysctl_ora.sysctl_var"),
classes => if_repaired("reload_sysctl");
commands:
reload_sysctl::
"/sbin/sysctl -p"
comment => "reload sysctl settings right now";
}
the editline set_variable_values body part is in the COPBL as is the
classes if_repaired body part.
Here they are so you don't have to hunt them down.
bundle edit_line set_variable_values(v)
body classes if_repaired(x)
{
promise_repaired => { "$(x)" };
}
bundle edit_line set_variable_values(v)
# Sets the RHS of variables in the file of the form
# LHS = RHS
# Adds a new line if no LHS exists, repairs RHS values if one does exist
#
# To use:
# 1) Define an array, where the keys are the LHS and the values are
the RHS
# "stuff[lhs-1]" string => "rhs1";
# "stuff[lhs-2]" string => "rhs2";
# 2) The parameter passed to the edit_line promise is the fully qualified
# name of the array (i.e., "bundlename.stuff") WITHOUT any "$" or "@"
bundle edit_line set_variable_values(v)
{
vars:
"index" slist => getindices("$(v)");
# Be careful if the index string contains funny chars
"cindex[$(index)]" string => canonify("$(index)");
field_edits:
# match a line starting like the key = something
"\s*$(index)\s*=.*"
edit_field => col("=","2","$($(v)[$(index)])","set"),
classes => if_ok("$(cindex[$(index)])_in_file"),
comment => "Match a line starting like key = something";
insert_lines:
"$(index)=$($(v)[$(index)])",
comment => "Insert a variable definition",
ifvarclass => "!$(cindex[$(index)])_in_file";
}
--
Nick Anderson <[email protected]>
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